PLATE IV. 
Fig. 
1 . Pleurophyllida 
cygnea Bergh. 
Lateral view. 
Fie. 
o 
2 . PleuropliyIJid a 
cygnea Bergh. 
Front view. 
Fig. 
3. Pleurophyllida 
cygnea Bergh. 
Ventral view. 
Fig. 
4. Pleurophyllida 
rows of teeth 
cygnea Bergh. 
on the radula. 
Arrangement transverse 
Fig. 
5. Pleurophyllida 
denticles. 
cygnea Bergh 
rachidian cusp with its 
Fig. 
0-7 Pleurophyllida cyguea ]>ergh. Accessory plates con- 
necting the rachidian with the laterals. 
Fig. 
8. Pleurophyllida 
aspect. 
cygnea Bergh. 
Lingual spines, exterior 
Fig. 
9. Pleurophyllida 
aspect. 
cygnea Bergh. 
Lingual spines, interior 
Fig. 
10. Pleurophyllida 
cygnea Bergh. 
Mandible. 
Fig. 11. Archidons varia Abraham. Teeth from the radula. 
Fie. 12. Arcludoris varia Abraham. An enlareed branchia. 
Fig. 13. Arcludoris varia Abraham. Radula. 
Fig. 14. Ceratosorna brevicaudattmi Abraham. An enlarged 
brancliia. 
Fig. IS. Hypselodoris epiciiria V>i\SQdoy^^ k .An enlarged 
branchia. i- 
Fig. 16. Nevibrotha verconis Basedow k fledley. Row of teeth 
from radula. 
Fig. 17. Ilal^erda graphica Basedow & Hedley. Enlarged teeth 
from the radula. 
Fig. 18. Hcdgerda graphica Bascdtjw Sc Fledley. Teeth from the 
radula. 
Fig. 19. Aetliodoris vcrcoiis Basedow k Hedley. Teeth from the 
radula. 
Fig. 20. Aetliodoris verconiis Basedow k Hedle}'. Radula cross 
lines representing transverse rows of teeth. 
Fig, 21. }I\t>seIodoris epicuria Basedow Sc Hedley. \ entral view. 
